web-feature: Document picture-in-picture

The document picture-in-picture API creates an always-on-top window from arbitrary HTML content.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

WPE MiniBrowser

Linux

2026-07

Servo

Android

2026-07

ArkWeb

HarmonyOS

*

Chrome Browser

Android

*

Safari Browser

iOS

*